#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys

sys.path.append('..')
from common_utils import CBBCommonUtils


def get_plugin_info():
    plugin_info = {
        "name": "centos_access_control_008 Set_the_histsize_of_shell_command",
        "plugin_id": "centos_access_control_008",
        "plugin_type": "Access Control",
        "info": "Set the histsize of shell command to pervent attackers from obtaining confidential information.",
        "level": "B",
        "module": "Safety reinforcement",
        "author": "congshz",
        "keyword": "Safety reinforcement",
        "configable": "false"
    }
    return plugin_info


logger = None
cur_user = None
cur_module = None
cur_task = None


def set_plugin_logger(setter, user, module, task, *args, **kwargs):
    global logger, cur_user, cur_module, cur_task
    logger = setter
    cur_user = user
    cur_module = module
    cur_task = task


# 扫描函数
def scan(ip, sys_user, sys_pwd, flag=0, reinforce_flag=False):
    des_list = []
    error_count = 0
    # 获取历史命令条数
    cmd = "cat /etc/profile | grep HISTSIZE="
    result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
    # 检错，每次执行命令都会进行检错，并决定返回退出/继续执行
    if not result and len(output) != 0:
        # 返回值格式化，去除不需要的内容/符号
        output = output[0].split("=")[1]
        # 历史记录条数过多警告
        if int(output) > 5:
            histsize_des = "HISTSIZE is DANGEROUS. now is {}.".format(output)
            error_count += 1
            logger.debug_warning(cur_user, cur_module, cur_task+'_Scan', '', histsize_des)
            des_list.append(histsize_des)
        else:
            histsize_des = "HISTSIZE is SAFE. now is {}.".format(output)
            des_list.append(histsize_des)
            logger.debug_info(cur_user, cur_module, cur_task+'_Scan', '', histsize_des)
    elif not result and len(output) == 0:
        des = "HISTSIZE is NOT EXIST."
        error_count += 1
        logger.debug_warning(cur_user, cur_module, cur_task + '_Scan', '', des)
        des_list.append(des)
    else:
        error_des = "CMD process ERROR. Error info: {}".format(result[0].replace("\n", ""))
        des_list.append(error_des)
        error_count += 1
        logger.debug_error(cur_user, cur_module, cur_task+'_Scan', '', error_des)
        return des_list, error_count

    cmd_filesize = "cat /etc/profile | grep HISTFILESIZE="
    result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd_filesize, username=sys_user, passwd=sys_pwd)
    # 检错，每次执行命令都会进行检错，并决定返回退出/继续执行
    if not result and len(output) != 0:
        # 返回值格式化，去除不需要的内容/符号
        output = output[0].split("=")[1]
        # 历史记录条数文件过大警告
        if int(output) > 5:
            histsize_des = "HISTFILESIZE is DANGEROUS. now is {}.".format(output)
            error_count += 1
            logger.debug_warning(cur_user, cur_module, cur_task+'_Scan', '', histsize_des)
            des_list.append(histsize_des)
        else:
            histsize_des = "HISTFILESIZE is SAFE. now is {}.".format(output)
            des_list.append(histsize_des)
            logger.debug_info(cur_user, cur_module, cur_task+'_Scan', '', histsize_des)
    elif not result and len(output) == 0:
        des = "HISTFILESIZE is NOT EXIST."
        error_count += 1
        logger.debug_warning(cur_user, cur_module, cur_task + '_Scan', '', des)
        des_list.append(des)
    else:
        error_des = "CMD process ERROR. Error info: {}".format(result[0].replace("\n", ""))
        des_list.append(error_des)
        error_count += 1
        logger.debug_error(cur_user, cur_module, cur_task+'_Scan', '', error_des)
        return des_list, error_count

    if not reinforce_flag:
        des_list.append("Scan Complete.")
        logger.debug_info(cur_user, cur_module, cur_task+'_Scan', '', 'Scan Complete.')
        if error_count != 0:
            # 是否加固
            if flag == 1:
                reinforce_des, reinforce_err = reinforce(ip, sys_user, sys_pwd)
                des_list.extend(reinforce_des)
                if reinforce_err == 0:
                    error_count = 0
    return des_list, error_count


# 加固函数
def reinforce(ip, sys_user, sys_pwd):
    des_list = []
    error_count = 0
    # 备份文件，文件名中的HS为HISTSIZE缩写，为了针对功能点控制备份文件用，避免备份冲突
    cmd = "cp /etc/profile /etc/profile.HS.`date +%Y-%m-%d`"
    result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
    if not result:
        # 检查是否备份成功
        check_cmd = "ls /etc | grep profile.HS.`date +%Y-%m-%d`"
        check_result, check_output = CBBCommonUtils.cbb_run_cmd(ip, check_cmd, username=sys_user, passwd=sys_pwd)
        if not check_result and len(check_output) != 0:
            backup_check_des = "Backup SUCCEED."
            logger.debug_info(cur_user, cur_module, cur_task+'_Reinforce', '', backup_check_des)
        else:
            error_count += 1
            backup_check_des = "Backup check FAILED."
            logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', backup_check_des)
            des_list.append(backup_check_des)
            return des_list, error_count
    else:
        error_count += 1
        backup_des = "Backup FAILED."
        logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', backup_des)
        des_list.append(backup_des)
        return des_list, error_count
    # 查找文件中需要更改的行，不硬编码以适应其他情况
    grep_cmd = "cat /etc/profile | grep HISTSIZE="
    result, output = CBBCommonUtils.cbb_run_cmd(ip, grep_cmd, username=sys_user, passwd=sys_pwd)
    if not result and len(output) != 0:
        # 组装命令
        safe_cmd = "sed -i '/" + output[0].replace("\n", "") + "/cHISTSIZE=5' \"/etc/profile\""
    else:
        error_count += 1
        cat_error = "Get target ERROR.Error info: {}.".format(result[0].replace("\n", ""))
        logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', cat_error)
        des_list.append(cat_error)
        return des_list, error_count
    # 修改对应行的内容
    CBBCommonUtils.cbb_run_cmd(ip, safe_cmd, username=sys_user, passwd=sys_pwd)

    grep_filesize_cmd = "cat /etc/profile | grep HISTFILESIZE="
    result_file, output_file = CBBCommonUtils.cbb_run_cmd(ip, grep_filesize_cmd, username=sys_user, passwd=sys_pwd)
    if not result_file and len(output_file) != 0:
        safe_cmd = "sed -i '/" + output[0].replace("\n", "") + "/cHISTFILESIZE=5' \"/etc/profile\""
    elif not result_file and len(output_file) == 0:
        safe_cmd = "sed -i '/HISTSIZE=/aHISTFILESIZE=5' \"/etc/profile\""
    else:
        error_count += 1
        cat_error = "Get target ERROR.Error info: {}.".format(result[0].replace("\n", ""))
        logger.debug_error(cur_user, cur_module, cur_task + '_Reinforce', '', cat_error)
        des_list.append(cat_error)
        return des_list, error_count
    CBBCommonUtils.cbb_run_cmd(ip, safe_cmd, username=sys_user, passwd=sys_pwd)

    # 检查是否加固成功
    des_reinforce_scan, error_reinforce_scan = scan(ip, sys_user, sys_pwd, flag=0, reinforce_flag=True)
    des_list.extend(des_reinforce_scan)
    error_count = error_count + error_reinforce_scan
    if error_count != 0:
        # 加固不成功，回滚
        des = "Reinforce FAILED."
        des_list.append(des)
        logger.debug_info(cur_user, cur_module, cur_task + '_Reinforce', '', des)
        rollback_des, rollback_err = rollback(ip, sys_user, sys_pwd)
        des_list.extend(rollback_des)
        return des_list, error_count

    des_list.append("Reinforce Complete.")
    logger.debug_info(cur_user, cur_module, cur_task+'_Reinforce', '', "Reinforce Complete.")
    return des_list, error_count


# 回滚函数
def rollback(ip, sys_user, sys_pwd):
    des_list = []
    error_count = 0
    # 查找备份文件，此处的查找支持多备份文件的查找（结果会按时间顺序排序），并默认回滚最新一次备份的内容，可以连续多次回滚
    grep_cmd = "ls /etc/ | grep profile.HS.*"
    result, output = CBBCommonUtils.cbb_run_cmd(ip, grep_cmd, username=sys_user, passwd=sys_pwd)
    if not result and len(output) != 0:
        logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', "Backup file FOUND.")
        target = output[len(output) - 1].replace("\n", "")
        cmd = "/bin/cp -rf /etc/" + target + " /etc/profile"
    else:
        error_count = -1
        des_list.append("Backup file NOT FOUND.")
        logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', "Backup file not found.")
        return des_list, error_count
    # 回滚文件，
    result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
    if not result:
        logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', "Rollback SUCCEED.")
        del_cmd = "rm -rf /etc/" + target
        # 删除对应的备份文件
        result, output = CBBCommonUtils.cbb_run_cmd(ip, del_cmd, username=sys_user, passwd=sys_pwd)
        if not result:
            del_des = "Backup file deleted. Target is {}.".format(target)
            logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', del_des)
        else:
            error_count += 1
            del_des = "Backup file delete FAILED."
            logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', del_des)
            des_list.append(del_des)
            return des_list, error_count
    else:
        error_count += 1
        des = "Rollback FAILED, please retry."
        des_list.append(des)
        logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', des)
        return des_list, error_count
    des_list.append("Rollback Complete.")
    logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', "Rollback Complete.")
    return des_list, error_count


def check(ip, *args, **kwargs):
    sys_user = kwargs.get("system_user")
    sys_pwd = kwargs.get("system_pwd")
    comm = kwargs.get("command")
    try:
        des_list = []
        des_start = "centos_access_control_008 Start."
        logger.debug_info(cur_user, cur_module, cur_task+'_Check', '', des_start)
        if comm == 1:
            des_scan, error_scan = scan(ip, sys_user, sys_pwd, flag=0)
            des_list.extend(des_scan)
            step_error = int(error_scan)
        elif comm == 2:
            des_reinforce, error_reinforce = scan(ip, sys_user, sys_pwd, flag=1)
            des_list.extend(des_reinforce)
            step_error = int(error_reinforce)
        elif comm == 3:
            des_rollback, error_rollback = rollback(ip, sys_user, sys_pwd)
            des_list.extend(des_rollback)
            step_error = int(error_rollback)
        else:
            return {"code": 3, "count": 0, "des": ['command must be 1/2/3']}
        des_end = "centos_access_control_008 Complete."
        logger.debug_info(cur_user, cur_module, cur_task+'_Check', '', des_end)
        if step_error == 0:
            code = 0
        elif step_error <= -1:
            code = 2
        else:
            code = 1
        return {"code": code, "count": step_error, "des": des_list}
    except Exception as er:
        code = 1
        des = ["ERROR:", str(er)]
        logger.debug_error(cur_user, cur_module, cur_task+'_Check', '', des)
        return {"code": code, "count": 0, "des": des}

# check(ip="100.2.91.150", system_user="root", system_pwd="admin", command=0, flag=0)
